linux-kernel - Re: [PATCH 1/2] perf: arm_pmuv3: Remove cyclical dependency with kvm

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <Z6KoUBdmjVRuqPnU@linux.dev>
Date: Tue, 4 Feb 2025 23:52:48 +0000
From: Oliver Upton <oliver.upton@...ux.dev>
To: Colton Lewis <coltonlewis@...gle.com>
Cc: kvm@...r.kernel.org, Russell King <linux@...linux.org.uk>,
	Catalin Marinas <catalin.marinas@....com>,
	Will Deacon <will@...nel.org>, Marc Zyngier <maz@...nel.org>,
	Joey Gouly <joey.gouly@....com>,
	Suzuki K Poulose <suzuki.poulose@....com>,
	Zenghui Yu <yuzenghui@...wei.com>,
	Mark Rutland <mark.rutland@....com>,
	linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
	kvmarm@...ts.linux.dev
Subject: Re: [PATCH 1/2] perf: arm_pmuv3: Remove cyclical dependency with
 kvm_host.h

Hi Colton,

On Tue, Feb 04, 2025 at 07:57:07PM +0000, Colton Lewis wrote:
> asm/kvm_host.h includes asm/arm_pmu.h which includes perf/arm_pmuv3.h
> which includes asm/arm_pmuv3.h which includes asm/kvm_host.h This
> causes confusing compilation problems when trying to use anything in
> the chain.
> 
> Break the cycle by taking asm/kvm_host.h out of asm/arm_pmuv3.h
> because asm/kvm_host.h is huge and we only need a few functions from
> it. Move the required declarations to asm/arm_pmuv3.h.
> 
> Signed-off-by: Colton Lewis <coltonlewis@...gle.com>

Please do not move KVM namespaced functions into non-KVM headers. Having
a separate header for KVM<->PMUv3 driver interfaces is probably the
right thing to do, especially since you're going to be adding more with
partitioned PMU support.

-- 
Thanks,
Oliver